Heterosis Studies on Grain Yield and Yield Attributes in Rice (Oryza sativa L.)

Abstract

The present study was carried out to determine the best heterotic combinations in terms of grain yield and its attributes in rice. For this, 5 lines are crossed with 2 testers in the Line x Tester mating design and their F1s are evaluated along with their parents and checks in randomized block design with three replications at Agriculture Research Station Kampasagar, Nalgonda during Kharif 2022.The degree of heterosis varied between traits. Six of the 10 hybrids under study showed significant positive heterosis, heterobeltiosis and standard heterosis for grain yield, outperforming the best check RNR 15048. The crosses KNM 1638 x IET 23993 and JGL 27356 x PTB 33 exhibited superior heterosis for early flowering, plant height, number of productive tillers per plant, grain yield per plant, hulling, milling and good head rice recovery percent over standard check. Based on sca effect and standard heterosis these two crosses were found to be promising for grain yield and its components. Hence these cross combinations could be utilized for exploitation of heterosis in rice.